If you're looking to learn about cast iron, and you're a small family of one or two, this is a great starter piece(s) for the price: Amazon.com: Lodge Logic LCC3 Pre-Seasoned Combo Cooker, 10.25-inch: Home & Kitchen
The only thing I had an issue with is that apparently newer cast iron will react with acidic foods, so it will discolor tomato and even onion at first. Once you've beat it up by cooking in it, scrubbing it, and re-seasoning it, it should be fine for just about anything. I use mine almost daily.
"Right is right, even if no one is doing it; wrong is wrong, even if everyone is doing it." - St. Augustine